package com.nowcoder.community.controller;

import com.google.code.kaptcha.Producer;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.service.UserService;
import com.nowcoder.community.util.CommunityConstant;
import com.nowcoder.community.util.CommunityUtil;
import com.nowcoder.community.util.MailClient;
import com.nowcoder.community.util.RedisKeyUtil;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.CookieValue;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;

import javax.imageio.ImageIO;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;
import java.util.concurrent.TimeUnit;

@Controller
public class LoginController implements CommunityConstant {

    private static final Logger logger = LoggerFactory.getLogger(LoginController.class);

    @Autowired
    private UserService userService;

    @Autowired
    private Producer kaptchaProducer;

    @Value("${server.servlet.context-path}")
    private String contextPath;

    @Autowired
    private TemplateEngine templateEngine;

    @Autowired
    private MailClient mailClient;

    @Autowired
    private RedisTemplate redisTemplate;

    @RequestMapping(path = "/register", method = RequestMethod.GET)
    public String getRegisterPage() {
        return "/site/register";
    }

    @RequestMapping(path = "/login", method = RequestMethod.GET)
    public String getLoginPage() {
        return "/site/login";
    }

    @RequestMapping(path = "/register", method = RequestMethod.POST)
    public String register(Model model, User user) {
        Map<String, Object> map = userService.register(user);
        if (map == null || map.isEmpty()) {
            model.addAttribute("msg", "注册成功,我们已经向您的邮箱发送了一封激活邮件,请尽快激活!");
            model.addAttribute("target", "/index");
            return "/site/operate-result";
        } else {
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            model.addAttribute("emailMsg", map.get("emailMsg"));
            return "/site/register";
        }
    }

    // http://localhost:8080/community/activation/101/code
    @RequestMapping(path = "/activation/{userId}/{code}", method = RequestMethod.GET)
    public String activation(Model model, @PathVariable("userId") int userId, @PathVariable("code") String code) {
        int result = userService.activation(userId, code);
        if (result == ACTIVATION_SUCCESS) {
            model.addAttribute("msg", "激活成功,您的账号已经可以正常使用了!");
            model.addAttribute("target", "/login");
        } else if (result == ACTIVATION_REPEAT) {
            model.addAttribute("msg", "无效操作,该账号已经激活过了!");
            model.addAttribute("target", "/index");
        } else {
            model.addAttribute("msg", "激活失败,您提供的激活码不正确!");
            model.addAttribute("target", "/index");
        }
        return "/site/operate-result";
    }

//    @RequestMapping(path = "/kaptcha",method = RequestMethod.GET)
//    /**
//     * void 因为生成的是特殊的图片所以返回值设置为void
//     * 把生成的图片手动加载到response里
//     * session 因为存的是敏感数据所以用session比较合适
//     */
//    public void getKaptcha(HttpServletResponse response, HttpSession session){
//        // 生成验证码，上面需要注入bean
//        String text = kaptchaProducer.createText();
//        // 通过生成的字符串去画一个图片
//        BufferedImage image = kaptchaProducer.createImage(text);
//        // 将验证码存入session里面
//        session.setAttribute("kaptcha",text);
//        // 将图片输出给浏览器
//        // 首先声明返回的是什么格式的数据
//        // 整个response由springboot维护，它会自动进行关闭
//        response.setContentType("image/png");
//        // 图片和浏览器进行响应需要获取他的输出流
//        try {
//            // 可以输出字符流或字节流，图片输出字节流比较好
//            OutputStream os = response.getOutputStream();
//            // 向浏览器输出图片可以用工具输出图片
//            ImageIO.write(image,"png",os);
//        } catch (IOException e) {
//            logger.error("响应验证码失败"+e.getMessage());
//        }
//    }
//
//    @RequestMapping(path = "/login", method = RequestMethod.POST)
//    public String login(String username, String password, String code, boolean rememberme,
//                        Model model, HttpSession session, HttpServletResponse response) {
//        // 检查验证码
//        String kaptcha = (String) session.getAttribute("kaptcha");
//        if (StringUtils.isBlank(kaptcha) || StringUtils.isBlank(code) || !kaptcha.equalsIgnoreCase(code)) {
//            model.addAttribute("codeMsg", "验证码不正确!");
//            return "/site/login";
//        }
//
//        // 检查账号,密码
//        int expiredSeconds = rememberme ? REMEMBER_EXPIRED_SECONDS : DEFAULT_EXPIRED_SECONDS;
//        Map<String, Object> map = userService.login(username, password, expiredSeconds);
//        if (map.containsKey("ticket")) {
//            Cookie cookie = new Cookie("ticket", map.get("ticket").toString());
//            cookie.setPath(contextPath);
//            cookie.setMaxAge(expiredSeconds);
//            response.addCookie(cookie);
//            return "redirect:/index";
//        } else {
//            model.addAttribute("usernameMsg", map.get("usernameMsg"));
//            model.addAttribute("passwordMsg", map.get("passwordMsg"));
//            return "/site/login";
//        }
//    }

    @RequestMapping(path = "/kaptcha", method = RequestMethod.GET)
    public void getKaptcha(HttpServletResponse response/*, HttpSession session*/) {
        // 生成验证码
        String text = kaptchaProducer.createText();
        BufferedImage image = kaptchaProducer.createImage(text);

        // 将验证码存入session，把存入session改为存入redis
        // session.setAttribute("kaptcha", text);
        // 存入key,key需要验证码的归属者
        // 给客户端临时颁发凭证，是个随机字符串就好；凭证要传给客户端，用cookie进行存储；设置cookie的保存时间、路径然后进行添加
        // 将验证码存入redis-》在这可以直接设置时间
        String kaptchaOwner = CommunityUtil.generateUUID();
        Cookie cookie = new Cookie("kaptchaOwner", kaptchaOwner);
        cookie.setMaxAge(60);
        cookie.setPath(contextPath);
        response.addCookie(cookie);
        // 将验证码存入Redis
        String redisKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
        redisTemplate.opsForValue().set(redisKey, text, 60, TimeUnit.SECONDS);

        // 将突图片输出给浏览器
        response.setContentType("image/png");
        try {
            OutputStream os = response.getOutputStream();
            ImageIO.write(image, "png", os);
        } catch (IOException e) {
            logger.error("响应验证码失败:" + e.getMessage());
        }
    }


    // 具体登陆的时候也要用-》login
    // 验证验证码
    // 首先判断验证码是否生效，无效的话还是返回登陆页面
    // 从redis里面进行取值
    @RequestMapping(path = "/login", method = RequestMethod.POST)
    public String login(String username, String password, String code, boolean rememberme,
                        Model model, /*HttpSession session, */HttpServletResponse response,
                        @CookieValue("kaptchaOwner") String kaptchaOwner) {
        // 检查验证码
        // String kaptcha = (String) session.getAttribute("kaptcha");
        String kaptcha = null;
        if (StringUtils.isNotBlank(kaptchaOwner)) {
            String redisKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
            kaptcha = (String) redisTemplate.opsForValue().get(redisKey);
        }

        if (StringUtils.isBlank(kaptcha) || StringUtils.isBlank(code) || !kaptcha.equalsIgnoreCase(code)) {
            model.addAttribute("codeMsg", "验证码不正确!");
            return "/site/login";
        }

        // 检查账号,密码
        int expiredSeconds = rememberme ? REMEMBER_EXPIRED_SECONDS : DEFAULT_EXPIRED_SECONDS;
        Map<String, Object> map = userService.login(username, password, expiredSeconds);
        if (map.containsKey("ticket")) {
            Cookie cookie = new Cookie("ticket", map.get("ticket").toString());
            cookie.setPath(contextPath);
            cookie.setMaxAge(expiredSeconds);
            response.addCookie(cookie);
            return "redirect:/index";
        } else {
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            return "/site/login";
        }
    }

    @RequestMapping(path = "/logout", method = RequestMethod.GET)
    public String logout(@CookieValue("ticket") String ticket) {
        userService.logout(ticket);
        SecurityContextHolder.clearContext();
        return "redirect:/login";
    }

    // 忘记密码页面
    @RequestMapping(path = "/forget",method = RequestMethod.GET)
    public String getForgetPage(){
        return "/site/forget";
    }
    // 获取验证码
    @RequestMapping(path = "/forget/code",method = RequestMethod.GET)
    public String getForgetCode(String email,HttpSession session){
        // 判断空值
        if (StringUtils.isBlank(email)){
            return CommunityUtil.getJSONString(1,"邮箱不能为空");
        }
        // 发送邮箱
        Context context = new Context();
        context.setVariable("email",email);
        String code = CommunityUtil.generateUUID().substring(0,4);
        context.setVariable("verifyCode",code);
        String content = templateEngine.process("/mail/forget",context);
        mailClient.sendMail(email,"找回密码",content);

        // 保存验证码
        session.setAttribute("verifyCode",code);
        return CommunityUtil.getJSONString(0);
    }
    // 重置密码
    @RequestMapping(path = "/forget/password", method = RequestMethod.POST)
    public String resetPassword(String email,String verifyCode, String password,
                                Model model, HttpSession session){
        String code = (String)session.getAttribute("verifyCode");
        if (StringUtils.isBlank(verifyCode)){
            model.addAttribute("codeMsg","验证码错误");
            return "/site/forget";
        }
        Map<String, Object> map = userService.resetPassword(email, password);
        if (map.containsKey("user")){
            return "redirect:/login";
        }else {
            model.addAttribute("emailMsg",map.get("emailMsg"));
            model.addAttribute("passwordMsg",map.get("passwordMsg"));
            return "/site/forget";
        }
    }

}
